Ink and process for producing same.



3om'r 'HoonsTETTnn, or CINCINNATI, 01110, ASSIGNOR To THE .AUL'J. a wrnoae COMPANY, 01' CINCINNATI, OHIO, A CORPORATION OF OHIO.

INK AND PROCESS FOIB. PRODUCING SAME.-

Re Drawing.

" To all "whom it may concern.

clear, and exact description thereof.

'prevent the pad from used the ink is apt to gum stencil. Gum tragacanth has been ad ed in This invention relates to a novel ink and process for producing same and consistsof the matters hereinafter described and more particularlyv pointed out in the appended claims. Y

The improved ink is designedparticularly for use on a mimeograph or like machine, and especially for use on an oscillating or rotary mimeograph and is of the general type of the mimeograph inks descrlbed in Letters Patent of the United States Nos. 928,915 and 928,450 heretofore granted to me on the 20th day of July, 1909.

mimeograph ink of the klnd described contains Turkey red oil and glycerin. The glycerin being hygroscopic will absorb moisture, so that when exposed in damp weather or in places where -a moist temperature" maintains, the ink becomes thin in body and tinctorially-weak. As a result the print made will be broad and weak in character and the letters will lack the degree of sharpness desirable in order to make the work on the mimeo ph approximate the appearance of oo work on a. typewriting machine, whic is the end aimed at in mimeograph work. In addition, in the case of the prior inks referred to, if an ink pad were allowed to remain on the mimeograph machine, the moisture absorbed bythe inkwould attack and corrode the cylinder with the result that in 'a com aratively short time the holes would become entirely plugged up, so as to ee ing the ink continuously to the stencil.

the ink toa minimum and lncreasing the proportion of Turkey red oil toa maximum, the hygroscopic qllllality of the ink is reduced, but lftOO muc Turkey'red oil is and 010 the a small proportion to the ink' to act as a Specification of Letters Patent.

in the cyllnder -when By reducing the proportion of glycerin in Patented- May 22, 1917.

Application filed November 11, 1914. Serial in. 871,464.

sponge or skeleton to hold the pigment in the varnish, but its use alone has not been entirely successful.

' My improved ink overcomes all these difficulties and is made as follows:

I take an ink of the kind described in the patents hereinbefore referred to, and which consists generally of a pigment ground in a mixture of glycerin and Turkey red oil or other sulfonated oil. In the case of organic pigments, the pigment is constructed on a base which will not enter into a chemical reaction with glycerin, such, for example, as barium sulfate. To this ink, which is preferably made with a maximum of the Turkey-red oil or other sulfonated oil and a minimum of glycerin, I add rosin varnish,

preferably to the amount of from five to ten per cent. of the weight of the ink, the said ink and varnish are first mixed as thoroughly as may be in a pony mixer and the mixture is then run through a three-roller mill. The result of this treatment is apparently the formation of an emulsion which is of a permanent character and. on standing there is no tendency of the glycerin and the Turkey red oil to separate from the rosin varnish.

An ink made in this way may stand for almost an indefinite period, at least for about six months, without thickening and it alsomay stand'on the pad for about the same period without drying, so that at the end' of said period the pad will do good work.

- The rosin varnish helps to prevent the pigment from settling and in addition seems to shorten the time of setting of the ink printed and prevents the spreading of the Ink. v

As a specific example of one way to make my improved ink, I proceed as follows:

I ing the glycerin I dissolve with it 1% by ment to dissolve to a slight extent in the vehicle and this tendency of going into solution is increased as the ink is allowed to stand. In the case of such inks made as above described with the addition of rosin varnish, this tendency is checked in a great measure and such purple and blue mimeograph inks produce sharper prints and the work seems to have a cleaner appearance.

While I prefer the use of rosin varnish in the manufacture of my ink, the invention is not limited thereto, as a like result is produced with the use of other varnishes, for example, any gum varnish, that is to say, a varnish composed of oil, and of a gum such askauri, Manila or similar gums.

I claim as my invention:

1.- An ink for mimeographs and the like, comprising, a pigment, a sulfonated oil and glycerin and a gum varnish, substantially in the proportions described.

2. An ink for mimeographs and the like comprising a pigment, a sulfonated oil and glycerin, to which is added a gum varnish, the varnish being thoroughly mixed with and ground into the other lngredients of the ink, the ingredients being substantially in the proportions described.

3. An ink for mimeographs and the like consisting of an ink of the kind described comprising a pigment, a sulfonated oil and glycerin, substantially in the roportions described, to which has been added about 5% by weight of a gum varnish, the m varnish bein thoroughly ground into and mixed wit the ink.

4. An ink for mimeographs and the like consisting of an emulsion of gum varnish and a mimeograph ink of the kind described containing a pigment, a sulfonated oil and glycerin, the ingredients of the ink being substantially in the proportions described.

5. The process of producing an ink for mimeographs .and the like which consists in grinding a pigment, a sulfonated oil and glycerin, then mixing therewith a gum varnish," all substantially in the proportions described, then grinding the gum varnish thoroughly into the ingredients of the ink to form an emulsion.

In testimony that I claim the foregoing as my invention I afiixmy signature in the presence of two witnesses, this 29th day of October, A. D. 1914.

ROBERT HOCHSTETTER.

Witnesses:

CHARLES AULT MANSELL, BERTHA A. ZUISER. 

